Air-ejector.



D. B. MORISON.

AIR HECTOR.

APPLIUATION FILED SEPT. 29,1910.

Patented Mar. 4, 1913.

DONALD BARNS MOBISON, OF I-IARTLEPOOL, ENGLAND.

AIR-EJECTOR.

Specification of Letters Patent.

Original application filed April 29, 1910, Serial No. 558,329. Divided and this application filedseptember To all whom it may concern:

Be it known that I, DONALD BARNS Moniso1\, a subject of the King of Great Britain and Ireland, residing at Hartlepool, in the county of Durham, England, have invented Improvements in or Relating to Air-Ejectors, of which the following is a specification.

This invention has reference to improved constructions of air ejector of the kind worked by the aid of water supplied thereto under pressure, or of water and steam, and suitable for use in connection inter (Ilia with steam condensin and vacuum producing apparatus of the Icind for example described in the specification of another application for Letters Patent filed by me April 29th, 1910, Serial N 0. 558,329, of which the present application is a division, whereby the scope andiusefulness of such apparatus can be increased.

An air ejector suitable for the purpose mentioned, comprises a water spraying device and a water jet device arranged in series or in parallel with eachother, or a water spraying device and a water et device arranged in parallel with each other and in.

series with a final water jet device, ora

steam nozzle witha water spraying or con- I (lensing device and a water jet device arranged in series or in paralleluvlth each other, or with a water spraying device and a water jet device arranged in parallel with each other and in series with a final water jet device, and means whereby the flow of fluid through the water jet devices and the steam nozzle, when used, can be severally controlled to suit varying working conditions. In the accompanying drawings, Figures 1 and 2 show, in vertical section, two constructions of air ejector embodying the present invention, together with a tanlc into which the ejector discharges, and a pumpfor-circulating water between the ejector and tank. As the air ejector is specially adapted for use with a steam engine condenser for withdrawing air and vapor therefrom, it will be now described in connection with such a con denser but it is to be understood that its use is not limited to a condenser as it may be used in connection with other vessels or devices that require to be exhausted.

In the example shown in Fig. 1, the air ejector comprises a pipe or casing f adapted Serial No. 5841518.

to be connected to a condenser by the branch 11 through which the mixture of air and vapor is withdrawn, and provided with a steam nozzle 8 arranged to discharge a jet of steam into the interior f of suchpipe or casing f through a tube g, a-water spraying and steam condensing device it having orifices a; for the discharge ofwater spray, and a solid water jet nozzle 1'; delivering into a combining cone f, the said orifices 00 and nozzle j being arranged in parallel with each other within the spraying chamber f of the casing f so as to discharge water simultaneously in parallel streams. Another .water jet -nozzle j of the annular type is. arranged valves Ir, Z, m respectively, so that each can be separately regulated or shut off in order to efiectively deal with the varying quantities of air in the condenser. The cross sectional area of the water passage through the water jet nozzle j may be varied by a tube 1' that can be adjusted in an endways direction by an eccentric device n that engages a recessed boss j on the tube j and is operated by a hand wheel 7). A non-return valve a may also be provided, such valve, in the form of a float, acting, should water rise in the casing f, to automatically close the'tube y and so prevent waterreentering the condenser th'rough the branch a.

It has been found by experiment, that in the case where a steam nozzle is provided in connection with the air ejector, that when the' condensing system is exceptionally air tight, or when the water jets are alone sufli- Patented Mar. 4, 1913.

cient to dominate the condenser, at the 'desired vacuum, and the steam to the steam jet is shut off, that the flow of airand vapor through the tube 9 into which the steam jet discharges, may become throttled by reason of the comparatively small diameter of such tube. In order to obviate such detrimental effect, the apparatus may be provided with a by-pass pipe a of ade uate'cross sectional area, such by-pass pipe eing fitted with a valve '0 which is closed when the amount of air justifies the use of the steam jet 8, and opened when the steam jet is out of use.

, alone centrifugal pump, by which water is withdrawnfrom the tank and delivered through a pipe Z to either or both of the two branches of the air ejector controlled by the valves Z, m. i

lVith the arrangement described, the supply of steam to the steam nozzle 8 and of water to the water spraying deviceh and central nozzle j, or to the water jet device j, can be separately regulated so that steam can be supplied to the steam nozzle and water to the-water spraying device and water jet device or to one of these devices, or the steam can be shut off and water supplied to the water jet device only, as may be required to satisfactorily deal with the amount of a ir present in the condenser at theparticular vacuum desired.

In Fig. 2, the water spraying device 71. consists of an amiular water chamber arranged above and independent of the central nozzle j and provided with an annular row of orifices or nozzles w. s is a water ejecting nozzle fed from the pump t through the pipe Z and which withdraws waterfromthe condenser through the pipe to and discharges it through a pipe 1) into the spraying chamber h whence it escapes through the spraying orifices w as already described, water being supplied separately to the nozzle j? through the valve m In some cases the steam nozzle 8 may be omitted, the air ejector being worked by water Also, the central waterjet nozzle j may in some cases be omitted.

lVhatI claim is 1. An air ejector-comprising, in combination, a chamber having at one end an inlet passage for air and at the other end a. combinin cone and a discharge pipe -leading.

therei rom, a water chamber provided with apertures through which multiple ets of condensing water-can enter said casing, a

nozzle having its discharge end terminatin within said combining cone and througli which a solid jet of water can be forced and caused to enter the combining cone as a solid jet of water and discharge the condensing water-and admixed air from said chamber through said combining cone and discharge pipe and a final water jet nozzle surrounding the combining cone and adapted to dis charge an annular stream of water into said,

discharge pipaat a point beyond the combining cone.

2. An air ejector comprising, in combination, a chamber having a gradually contracted lower end portion with a discharge pipe extending downward therefrom and at the top an upwardly extending inlet pipe of less cross sectional area than the chamber at 1ts widest part, an air and vapor inlet supplied thereto under pressure.

branch connected to but of greater cross sectional area than said inlet pipe, a steam nozzle arranged to directa jet of steam into said inlet pipe so that said jet will mingle with the air coming from said inlet branch and within the inlet, pipe, a water chamber having apertures through which a number of jets of condensing water can enter said chamberbelow said inlet pipe and minglewith the mixed air and steam in said chamber and condense the steam and a water jet nozzle arranged centrally in said chamber and terminating at its lower end in the low er contracted end portion of said cham ber so that a practically solid jet of water will issue into the said lower contracted end portion of the chamber and eject the mixture of condensing water, air and water of condensation falling into said lower end portion of the chamber through the discharge pipe intoihe external atmosphere.

An air ejector comprising, in combination, a chamber having a gradually contracted lower outlet end portion and a discharge pipe into which said outlet end portion discharges, an inlet pipe connected to the upper end of said casing and of smaller cross sectional area than the largest cross sectional area of said chamber and an air inlet branch connected to the upper end of said inlet pipe and of greater cross sectional area than said inlet pipe, a steam nozzle arranged to direct a jet of steam into said inlet pipe, a water chamber having a num-. ber of apertures through which jets of condensing water can en er sai'd casingbelow the inlet pipe, a centrally arranged water nozzle terminating in the lower contracted outlet end portion of said casing and through which a solid jet of water can be forced through the combining tube,- a centrally arranged vertically adjustable tube arranged to extend into the inlet of said discharge pipe and form an annular outletpassage therewith and means for manually adjusting said tube in an axial direction from the side of said casing whereby the cross sectional area of said passage can be varied. i

l. An air ejector comprising, incombination, a casing having an inlet pipe at one end and a combining cone and discharge pipe at the other end, said inlet pipe tenni nating iu.an air inlet branch of greater cross I sectional area than the inlet pipe, a steam nozzle arranged to 'discharge arjet of steam W e r into the inlet end of said inlet pipe, a water chamber provided with apertures through which multiple jets of water can issue into saicheasing ata part thereof beyond said steam nozzle'and' inletwpipe a1nozzle 'ter-, 5

minating in the combining cone antl c'hrough which a solid jet ofwater canissue and passthrough said combining cone as a solid et and discharge the mixture of air and water coming iron the upper part of the chamber through the con'ibining cone into said discharge pipe, and a water jet nozzle arranged around and external to the combining cone so as to discharge an ammlar stream of water into said discharge pipe at a point beyond the end of the combining jets of condensing water to enter into said chamber, and a by-pass pipe with controlling valve between said air inlet and condensing chamber, said b v-pass pipe being of larger cross sectional area than said connecting passage and through which air can freely flow when the controlling valve is open and the steam nozzle closed. I

(3. A water operated air ejector comprising, in combination. a condensing chamber having an uncontrolled main inlet pipe for ai and an outlet pipe for ai' and'watcr, a steam nozzle for directing a jet of steam into said inlet pipe, means for directing jets of water into said chamber, a downwardly extending discharge pipe in communication with the outlet from said chamber and an automatic tloat valve located in said chamher and adapted to rise and automaticall close the connnunication between said inlet pipe and chamber upon the steam and water supply being cut ott' and water rising through said discharge pipe sutlicientlv high within said chamber to lil't said valve.

7. An air ejector comprising, in combination. a casing having an air inlet branch and an air and water discharge pipe, an enlarged intermediate condensing chamber of curvilinear section terminating at its forward end in a combining cone, :1 connecting passage between said inlet branch and condensing chamber of considerably smaller cross section than either of these parts, a water chamber surrounding said combining cone so as to form therewith an annular water nozzle through which an annular jet of water will enterthe discharge pipe at a point beyond said combining cone, and

water inlet branches, one of said branches being in communication with said water chamber, a valve controlled steam nozzle arranged to discharge a jet of steam directly into said connecting passage so that such steam minglcs with the air coming :lrom the inlet branch and within the connecting passage, a 'water chamber arranged within said condensing chamber and in communication with another of said water inlet branches and provided with apertures through which jets of wat r can issue into said chan'iber be- 'cnd the connecting passage and steam nozzlc and condense the steam in the mixture of air and steam within said chamber and a centrally arranged water nozzle extending l'rom said water chamber and tern'linating within said combining cone-and through which a solid jet of water can be. discharged into and through the combining cone for the purpose herein set forth.

H. An air ejector comprising, in combination, a condensing chamber having at one end an inlet passage terminating at its inlet end in an air inlet branch ot much larger cross sectional area than the passage, and at the other end a combining cone and discharge pipc,'a steam nozzle arranged to discharge a jet of steam into the inlet end of said inlet passage so as to mingle with the air coming from the said inlet branch and within the said passage. a water chamber arranged within the said condensing chamber and provided with apertures through which jets of water can issue into said casing at a part thereof beyond said inlet passage and -stcam nozzle and condense the steam in said chamber and a linal water jet ttuZZlt comprising a water chamber snrromnling the combining cone and in ommuni ation with said discharge pi i and through which an annular trcam of water can be discharged into said discharge pipe at a point beyond the termination ot said cone. so as to force the mixture of air and water coming from the condensing chamber into and through said discharge pipe. all substantially as herein described and shown.

Signed at llartle mol. llngland. this thirteenth day of September [5 10.

DONALD l).\ll\'$ MUttIe-ON.

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